Process of manufacturing lime and carbonic acid.



N0. 65|,684. Patented June 12, I900. G. M. WESTMAN.

PROCESS OF lVlANUFl-H'STUFHNG LIME AND CARBONIC- ACID.

(Application filed Jan. 6. 1900.)

(No Model.)

Sheets-Sheet l.

WITNESSES flwu Patented lune l2, I900.

G. M. WESTMAN.

PROCESS OF MANUFACTURING LIME AND CARBONIC ACID.-

(Application fiied Jan. 6, 1900.)

2 Sheets-Sheet 2 (No Model.)

NQEH V WITNESSES A7701? EYS U ITED STATES.

PATENT OFFICE.

GUS'IAF M. \VESTMAN, OF NEW YORK, N. Y.

PROCESS OF MANUFACTQFING LIME AND CARBONIQ ACID.

SPECIFICATION forming part of Letters Patent No. 651,684, dated June 1 900.

Apolication filed January 6, 1900. Serial No. 615.

To roll whom, it may concern:

Be it known that I, GUSTAF ll/LlVESTMAN, a subject of the Kingot Sweden and Norway, and a rcsidcntol the city of New York,borough of Manhattan, in the county and State of New York, have invented a new and Improved Process for the Manufacture of Lime and Carbonic Acid, of which the following is a full,

clear, and exact description.

The object of the invention is to providca new and improved process for manufacturing lime and carbonic acid in such a simple and economical manner that both the lime and the carbonic acid are almost immediately in condition for the market.

The process consists, essentially, in passing a mixture of highly-heated carbonic acid and steam into and up through acolnmnot limestone to expel the carbonic acid contained in the limestone and to convert the latter into calcium oxid, then charging the expelled car bonic acid with water to cause the heat of the carbonic acid to convert the water in to steam and thereby red ucc its temperature, then conducting a portion of the cooled carbonic acid charged with steam into a regenerator to be highly heated therein and used in turn for expelling carbonic acid from the lime, as

above specified, and finally drawing off the calcium oxid from the 'base of the column.

In order to carry this process into elfect, I prefer the apparatus shown and described in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the improvement on the line 1] in Fig. 2 and with parts shown in elevation. Fig. 2 is a plan view of the same with parts in section, and Fig. 3 is a sectional plan view of the threeway valve, for passing theearbonic acid from the blower to either of the regenerators.

The apparatus shown in the drawings is (No specimens.)

the shaft-furnace A, directly-above the hop: per-bottom, enters-a pipe D, connected by valved branch pipes E E with 'regcncrators F F, respectively, of any approved construction and adapted to be alternately heated either by burning oil or prod ueer-gases. The regenerators serve to highly heat the mixture of carbonic acid and steam, as hereinafter more fully described and for the purpose stated.

From the upper end or the furnace A, directly below the filling device 13, leads a discharge-pipe G for carryingthc expelled car.- bonic acid from'the shaft-furnace A, and in the said pipe G is arranged a water-charging device ll, preferably in the form of arose, connected by a pipe I with a suitable watersnpply, so that water in spray form passes from the rose into the expelled carbonic acid, to be immediately converted into steam and to reduce the temperature of the carbohic acid. A portion of the carbonic acid, cooled and charged with steam, passes by an extension-pipe G to the bell J of a gas-holder of any approved construction, suit-able weights J being carried on chains J connected with said bell, so as to regulate the pressure in the holder, and consequently regulate the pressure of the gas in the shaft-furnace A.

From the pipe G, directly below thewatercharging device II, leads a pipe G? to a blower K of any approved construction, and the ou let-pipe K of the blower K is adapted to be connected with either of the pipes L L", leading into the lower ends of the regcnerators F F, respectively, a valve N under the control of the operator serving to connect the pipe K with either of. the said pipes L or I). The operation is as follows: When theshaltfurnace A is filled with limestone and'a mixture of carbonic acid and steam is contained in the holder J and the generator F has been heated and the branch pipe E is open and the other pipe E is closed and the valve N connects the pipe K with the pipe L and the blower K is set in motion, then a mixture of carbonic acid and steam is drawn from the holder J by way of the pipe G and the pipe G and forced through the pipes K and L into the regenerato1-F,'to be heated therein to a high degree, and then passes through the'pipes E and 1) into the lower end of the shaft-furnacc A, .to pass into and up through the column of limestone contained in the said shaftfurnaee A. The highly-heated mixture of carbonic acid and steam is the medium for heating the carbonate or limestone contained .in the shaft-furnace A and expelling the car;

, the latter mixing with the carbonic acid to form a mixture of carbonic acid and steam. .Part. of this mixture may be stored in the holder or receiver J and part is drawn into the blower K to be forced through the pipes K and L into and through the regeneratcr F, to

be heated and again passed through thelimestone contained in the i'urnace'A for the purpose abovc'mentioned. While (he regenerator F is in use, the other rcgencrator F is heated, as previously explained, and when the mixture of carbonic acid and steam passing through the regenerat-or F can no longer be heated in the said regen'erator to thede sired'degrcc then the valve N is shifted to connect the pipe K with the pipe L to pass the carbonic acid through the other re enera tor F, and thereby insure proper hea ing of the mixtiire to the desired degree. The valve in the branch pipe E is then opened, so as to pass the'iiighly-heated mixture "of carbonic acid and steam into and through the lime stone inthe furnace A for the pnrposepreviously described. While the regenerator F is cut out, as mentioned, it can be reheated in the usual manner to be ready for use as soon as the heat of the regeneratorF' has been used up for heating the mixture of carbonic acid is utilized for the pur ose, and by the acid and steam. v p

. From the foregoing it is evident that the water is converted into steam at very little expense, as the heat of theexpelled carbonic steam mixing with the expel ed'carbonic acid the tension of the latter is reduced, so that when the mixture of carbonic acid and steam,

after being reheated in the regenerator and passed into the furnaceA, insures a freer and easier liberation of the carbonic acid con- 5 5* tainedin the limestone.

The mixture of carbonic acid and steam forms the sole medium for conveying the heat into the limestone, and forthc above mentioned reason is better than either the carbonic acid or the steam separately. 4

13y cooling the carbo ic acid by the steam it is evident that the-blowerK is not aifected by excessive heat,and consequently its proper workiugis insured at all times. By rcduc-- ing the tension of the carbonic-acid gas by n the steam, it is not necessary to reheat themixture in the-regenerator above 1,000 centigrade,and the mixture of this degree of heat is so llicient to properly decompose the limestone in the furnace and to expel the carbonic-acid gas, as previously described. The steam itself does not affect the'limestone-or the lime at the high temperature mentioned to form hydrate of lime in the furnace.

By increasing or decreasing the weights J 2 on the holder the pressure in the holder and thatin the furnace A may be reduced or increased to prevent toohigh or too low-pressure in the furnace.

It is understood that the tension of thecarbonic acid is reduced by the steam in proportion to theamount of steam in the carbonic acid, and asthe amount of water can be regulated by suitable valves it is evident that the ized for heating and expelling purposes is readily stored in the holder II with its pro portionate amount of steam and can be withdrawn therefrom from time to. time into suitable vessels to be ready for the market, it being expressly understood that none of the carbonic acid is lost and the steam readily condenses in the holder, so as to free the-carbonic acid from the steam, and thereby leave thccarbonic acid in a pure state. 7

. It is evident from the foregoing that the process is continuous. and the gas expelled from the limestone in the shaft-furnace is utilized, first for converting water into steam to form a mixture of carbonic acid and steam,

the mixture being finally utilized as a heating medium for expelling the carbonic-acid gas from the limestone and at the same time forming the lime. Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 7 The continuous process of treating limestone, which consists in beatings mixture of carbonic acid. and steam passing this mixture through limestone, drawing off the expelled carbonic acid and lime produced, bringing the expelled carbonic acid in contact with water, to con vcrt the latter into steam to form a mixture of steam and carbonic acid, reheating a part of the mixture thus formed, and forcingthe mixture back into and through theJimestone, as set forth.

In testimony whereof I have signed my name to this specification in the presence oi two subscribing witnesses.

GUSTAF M. WESTMAN. 

